MasterSealM 808 is a two component, 100% solids, elastic polyurethane membrane, with high chemical and abrasion resistance. Approved for direct contact with potable water and foodstuff.

Features and benefits:

  • Regulation 31 approved. (Regulations 2014, 33 (3 a) in Scotland and Regulation 30 in Northern Ireland).
  • WRAS approved for use in contact with potable water, approval 1210500.
  • Can be applied on vertical and horizontal surfaces.
  • Easy to apply by roller or air-less spray equipment.
  • Resistant to standing water.
  • Elastic, flexible and crack bridging.
  • Protects concrete against carbonation and rebar corrosion: Once hardened it is impermeable to water and carbon dioxide.
  • High chemical resistance.
  • Excellent adhesive, mechanical and elastic properties (elongation, tensile and tear strength, abrasion).
  • Excellent freeze/ thaw resistance.
  • UV resistant.
  • 100% solids formulation, no risk for the environment and operative caused by solvent vapours.
  • CE marked.


Used in waterproofing applications where contact with potable water or a high level of chemical resistance is required.

  • Water towers, storage tanks or any other water retaining structures.
  • Interior coating to drinking water tanks.
  • Storage tanks containing foodstuffs etc.
  • Waste water treatment plants (commercial and industrial), both in the inflow and outflow areas.
  • Sewage effluent pipelines.
  • Steel and concrete pipes.

Additionally it can be applied on:

  • Horizontal and vertical substrates.
  • Internal and external areas.
  • Concrete, cementitious mortar or steel substrates.
  • Reinforced concrete to protect it against carbonation or chloride induced corrosion and for protection against chemical attack in secondary containment bunds in chemical and petrochemical industries.

Standard product features

Technical characteristics:

  • Density of mixed material: 1.2 g/cm³ (approximately).
  • Working time: 20 minutes.
  • Fully cured: After seven days.
  • Application temperature (substrate and material): 5–35°C.
  • Adhesion to concrete to EN 1542: 2.9 N/mm².
  • Adhesion to steel to EN 12636: > 10 N/mm².
  • Adhesion strength after freeze-thaw cycles to EN 13687-1: 2.6 N/mm².
  • CO2 permeability to EN 1062-6: SD 74 m.
  • Static crack bridging: Class A2 (-20°C), A3 (-10°C) and A4 (+23°C).
  • Dynamic crack bridging to EN 1062-7: B2.
  • Tensile strength to EN ISO 527-1/-2: > 20 N/mm².
  • Impact resistance to EN ISO 6272/2: 20 Nm.
  • Resistance to fire: Class F.
  • Water vapour permeability: Class II.
  • Resistance to a range of chemicals including diesel oil and nitric acid, consult datasheet for further information.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-55-70/305 Liquid tanking resin
45-35-50/340 Polyurethane waterproof coatings

NBS Specification

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This product is associated with the following NBS clauses:

Product specification

An important note about specifying



BASF plc, Construction Chemicals


+44 (0)161 485 6222

Product reference

MasterSeal M 808


[Light grey]

Manufacturer details

PO Box 4,
Earl Road,
Cheadle Hulme,
Cheshire, SK8 6QG
Tel +44 (0)161 485 6222
Fax +44 (0)161 488 5220
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NBS National BIM Library